linux-kernel - Re: [PATCH 08/11] phy: tegra: xusb: Disable trk clk when not using

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Message-ID: <Y2Z6Gzd3RmmxMaXO@matsya>
Date:   Sat, 5 Nov 2022 20:28:35 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Wayne Chang <waynec@...dia.com>
Cc:     gregkh@...uxfoundation.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, treding@...dia.com,
        jonathanh@...dia.com, thierry.reding@...il.com,
        heikki.krogerus@...ux.intel.com, ajayg@...dia.com, kishon@...com,
        p.zabel@...gutronix.de, balbi@...nel.org, mathias.nyman@...el.com,
        jckuo@...dia.com, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        singhanc@...dia.com, linux-i2c@...r.kernel.org,
        linux-phy@...ts.infradead.org, linux-tegra@...r.kernel.org
Subject: Re: [PATCH 08/11] phy: tegra: xusb: Disable trk clk when not using

On 24-10-22, 15:41, Wayne Chang wrote:

Consider revision of title to: "Disable trk clk when not in use"

> The change fixes an issue that the pad tracking is a one-time calibration
> for Tegra186 and Tegra194. We should disable the clk when it is done.
> The 100us delay is for HW recording the calibration value.

Consider:

"pad tracking is a one-time calibration for Tegra186 and Tegra194. clk
should be disabled after calibration.

Disable clk after claibration.

While at it add 100us delay  HW recording the calibration

> 
> Signed-off-by: Wayne Chang <waynec@...dia.com>
> ---
>  drivers/phy/tegra/xusb-tegra186.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/phy/tegra/xusb-tegra186.c b/drivers/phy/tegra/xusb-tegra186.c
> index 0996ede63387..f121b4ffbbfd 100644
> --- a/drivers/phy/tegra/xusb-tegra186.c
> +++ b/drivers/phy/tegra/xusb-tegra186.c
> @@ -609,6 +609,10 @@ static void tegra186_utmi_bias_pad_power_on(struct tegra_xusb_padctl *padctl)
>  	value &= ~USB2_PD_TRK;
>  	padctl_writel(padctl, value, XUSB_PADCTL_USB2_BIAS_PAD_CTL1);
>  
> +	udelay(100);
> +
> +	clk_disable_unprepare(priv->usb2_trk_clk);
> +
>  	mutex_unlock(&padctl->lock);
>  }
>  
> @@ -633,8 +637,6 @@ static void tegra186_utmi_bias_pad_power_off(struct tegra_xusb_padctl *padctl)
>  	value |= USB2_PD_TRK;
>  	padctl_writel(padctl, value, XUSB_PADCTL_USB2_BIAS_PAD_CTL1);
>  
> -	clk_disable_unprepare(priv->usb2_trk_clk);
> -
>  	mutex_unlock(&padctl->lock);
>  }
>  
> -- 
> 2.25.1

-- 
~Vinod